He was the first Executive Minister of the Iglesia ni Cristo.
He is the father of Eraño G.
Manalo, who succeeded him as Executive Minister of the INC, and the grandfather of Eduardo V.
Manalo, the current Executive Minister.
Because there were no precursors to the registered church, external sources and critics of the INC refer to him as its messenger.
The official doctrine of the Iglesia ni Cristo professes that Felix M.
Ysagun is the last messenger of God, sent to reestablish the church founded by Jesus Christ, which had fallen into apostasy following the end of the Apostolic Age.